Anvil for rotary die cutting



Nov. 1, 1966 L. E. sAur-:R 3,282,142

ANVIL FOR ROTARY DIE CUTTING Original Filed Sept. 17, 1962 ATTORNEYS UnitedStates Patent (DA 3,282,142 3 ANvILv FoR ROTARY l1am CUTTING Louis E. Sauer, St. LouisMo., assignor to` L. E. Sauer,Y Machine Company, St. Jous, Mo.a corporation of Missouri Original applicationv Sept..17, 1962, Ser. No. 224,003..-

The present application is a division of applicants earlier led application Serial No. 224,003, tiled Septem- -ber 17, 1962.

The present invention relates generally to rotary die cutting, `as rotary anvil-s, and the like. It is more particularly concerned with novel replaceable resilient cover construction for anvils.

There has long existed in rotary die cutting the need for long lasting anvil covers and quickly replaceable anvil covers which remain iirmly in position -while the anvil is in use, yet can be quickly replaced. Damage by cutting knives to anvil covers has heretofore been excessive, requiring undue down time and expensive replacement of elements. Lower slotting steel anvils have long caused undue pounding of equipment wit-h resulting damage to anvils and -concerned machinery in general.

Therefore, an object of the present invention is to provide novel anvils for rotary die cutting which fulll and satisfy the foregoing long existing needs.

In brief, the present novel structure incorporates a split anvil provided with a replaceable cover of polyurethane which is anchored in place by inter-engaging grooves and corresponding linear projections. Each cove-r incorporates a stop at the end to limit movement of the cover in respect to the anvil half.

Hence, another object is to provide a novel split anvil incorporating a removable novel cover of wear resisting material.

Another object is to provide a novel anvil incorporating a polyurethane cover.

Another object is to provide a novel rotary anvil incorporating a removable resilient cover.

Another object is to provide a novel split rotary anvil incorporating a readily and quickly removable resilient cover for each anvil part, each of which may be slipped into and removed from operative position, each being provided with means preventing relative peripheral sliding.

Another object is to provide an `anvil structure of the nature heretofore set forth which is highly efficient, long wearing and very effective for the intended purposes, readily employed with minimum instruction, and otherwise an improvement on existing structures.

The foregoing and other objects and advantages are apparent from the following description taken with the accompanying drawings, in which:

FIGURE 1 is an enlarged and elevational view of a split rotary anvil, parts being broken away for illustration of details;

FIGURE 2 is a further enlarged longitudinal crosssectional view taken on substantially the radial line 2-2 of FIGURE 1;

FIGURE 3 is a bottom view of a cover member for one-half of the rotary anvil of FIGURE 1 flattened for purposes of comparison with the surface on which it is located when in use;

FIGURE 4 is a view of one-half of the metal base of the rotary anvil of FIGURE 1 schematically flattened as FIGURE 3 for comparison of the inner engaging portions of the cover of FIGURE 3 with the surface of FIGURE 4;

FIGURE 5 is an enlarged cross-sectional view taken on substantially the line 5 5 of FIGURE 3; and

FIGURE v6 is an enlarged cross-.sectional View taken on ence numerals, 25 indicates generally a split rotary anvil incorporating teachings of the present invention including cover construction generally indicated by the reference numeral 27. The rotary anvil 25 is illustrated as including two opposed arcuate metal basesor halves 30 and 31 Iand a cover 70 removably mounted on eac-h half 30 and 31.

The member 70 ,includes ra pluralityof continuous undercut projections 71, four Ibeing illustrated. At one end of the member 70 an integral stop 72 is formed between adjacent projections 71, as is clear from FIGURE 3, in `which the inner side of a flattened member 70 is illustrated. The peripheries of the metal halves 30 and 31 are formed with annular grooves 74 and annular undercut lprojections 75, the two outside projections being undercut on the inner wall only. The intermediate projections 75 terminate short of the full half circle at one end to provide end spaces 76 which receive the integral stops 72 of the cover member 7 0.

It will be `apparent from the foregoing that the cover member 70 slips onto the metal half 30 or 31 simply by engaging the left end of the cover member 70, considering FIGURE 3, with the right end of the metal half 30, considering FIGURE 4, the .projetci-ons 71 of the cover member 70 entering the `grooves 74 of the periphery of the metal half 30. The cover member 70 i-s slipped along the periphery of the metal half 30 until t-he stops 72 engage the ends of the intermediate projections 75 of the metal half 30. The cover member 70 will remain rmly in place and will not slide around since the stops 72 and engaged projections ends on the cover members 70 and metal halves 30 and 31, respectively, will prevent this when the rotary anvil 25 is assembled, as in FIGURE l. However, the cover members 70 can be readily removed when necessary for repair, or other purpose, and as readily either replaced or a substitute cover 70 installed. Both down time and equipment expense are reduced to -a minimum. In addition, the polyurethane cover 70 is of far longer wearing life than rubber and other resilient materials heretofore employed.

It is manifest that the disclosed structure fulfills the objects and advantage-s sought therefor.

It is to be understood that the foregoing description and the accompanying drawings 'have been given by way of illustration and example. It is also to 'be understood that changes in form of the elements, rearrangement of parts, and substitution of equivalent elements, which will lbe -obvious to those skilled in the art, are contemplated as within the scope of the present invention which is limited only by the claims which follow.

What is claimed is:

1. In combination, a rotary anvil for die cutting comprising a base, and a resilient work engaging cover of resilient material mounted on said base, the cover having a lcontinuous surface longitudinally of the anvil, the outer surface of the base and the inner surface of the cover having axially spaced annularly disposed interengaging surfaces maintaining said cover on said base, said intcrengaging surfaces being of such a cross-section that said surfaces of said cover can be slipped into telescoped relation with said surfaces of said base.

2. In combination, a rotary anvil for die cutting comprising a base, and a resilient work engaging cover of resilient material mounted on said base, the outer 'surface of the base and the inner surface of the cover having axially spaced annularly disposed interengaging surfaces maintaining said cover on said base, said rotary anvil comprising two separable halves, each half including a base yand a resilient cover, Said resilient covers being readily removable from and remountable on said bases after separation Patented Nov. 1, 1966,,

of said halves by annular sliding movement of one of the cover half and the base half in respect to the other.

3. The combination of claim 2 in which the outer surface of each base and the inner surface of each cover include cooperative stop means limiting relative movement of each cover in respect to its base in one annular direction.

4. The combination of claim 3 in which said interengaging surface-s are of such a cross-section that said surfaces of said covers can be slipped into telescoped relation with said surfaces of said bases.

5. The combination of claim 3 in which said interengaging surfaces are surfaces of alternating annular projections and grooves formed on said base and said cover, and in which said stop means includes selected blocked grooves at one end of each cover half and selected cut-away projections at the corresponding end of each base half.

References Cited by the Examiner UNITED STATES PATENTS 2,333,592 11/1943 Sieg 83-347 X 2,621,741 12/1952 Kane 83-347 X 3,118,336 1/1964 Hampshire 83-347 X 3,119,312 1/1964 Henc. 3,162,076 12/1964 Emerson et al 83-347 X 3,200,687 8/1965 Paulson 83-659 X WILLIAM S. LAWSON, Primary Examiner. 

1. IN COMBINATION, A ROTARY ANVIL FOR DIE CUTTING COMPRISING A BASE, AND A RESILIENT WORK ENGAGING COVER OF RESILIENT MATERIAL MOUNTED ON SAID BASE, THE COVER HAVING A CONTINUOUS SURFACE LONGITUDINALLY OF THE ANVIL, THE OUTER SURFACE OF THE BASE AND THE INNER SURFACE OF THE COVER HAVING AXIALLY SPACED ANNULARLY DISPOSED INTERENGAGING SUR- 